来自《耶鲁大学开放课程：基础物理 第10集 第10集》

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  Here's one example.
  这是一个例子
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  There is a disk on a spindle that's spinning around.
  一个圆盘在轴上旋转
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  The disk has some moment of inertia I1,
  这个圆盘具有转动惯量 I1
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  spinning at some angular velocity ω1.
  以角速度 ω1 自转
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  On top of this is a second disk,
  在上方有第二个圆盘
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  just one millimeter away, and it's at rest.
  相距一毫米 处于静止
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  And it's got some moment of inertia I2,
  转动惯量为 I2
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  but it's got the same center as this guy.
  中轴相同
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  And then, this one falls on that one,
  当第二个圆盘落到第一个上面时
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  and the question is what happens?
  会发生什么
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  So, I think we all know what happens.
  我想我们都知道会发生什么
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  We all know the two will now stick together
  这两个圆盘会合为一体